It was first developed in 1979,was originally developed for the minicomputer an interface technology, but with the development of computer technology, and now it is completely ported to the ordinary microcomputer, SCSI is widely used such as:hard drives, CD-ROM,ZIP MO, scanners, tape drives, JAZ, Printers, CD burners and other equipment, as compared with other standard interface for faster transfer rates, so a good high-end computers, workstations, servers, commonly used as a hard disk and other storage device interface. Note: Most commonly encountered on scsi cards are the VHDCI 68-pin,High Density 68-pin, and High Density 50pin.